Prolific records 18,697,671 monthly visits with -1.8% month-over-month growth and Paid pricing. SniffSub records 0 monthly visits with 0% growth and Freemium pricing.
High-quality human data for AI training, evaluation, and research
Find your audience, pain points and leads on Reddit
| Dimension / Metric | ||
|---|---|---|
| Official Domain | prolific.com | sniffsub.com |
| Pricing Model | Paid | Freemium |
| Monthly Visits | 18.7M (18,697,671) | 0 (0) |
| MoM Traffic Delta | -352.04K (-1.8%) | 0 (0%) |
| Primary Market & Share | 🇺🇸 United States (48.8%) | 🌐 Global (—) |
| Direct Visits / mo | 12.98M | 0 |
| User Rating | 4.6 | 4.2 |
| Supported Platforms | Website | Website |
High-quality human data for AI training, evaluation, and research
Filter participants by detailed demographic, professional, and behavioural criteria and reach narrow or representative samples rather than a generic crowd.
Collect human preference data for model fine-tuning, run safety evaluations and red-teaming, and use a feedback API to plug humans into automated pipelines.
Attention checks, honesty screening, and approval workflows help filter out careless or fraudulent responses before you analyse results.
Publish a study and begin collecting responses quickly, with tooling that supports screening, quotas, and longitudinal designs.
Find your audience, pain points and leads on Reddit
Enter any subreddit and get instant metrics including subscriber counts, engagement patterns, trending themes, and the best times to post.
Build curated collections of subreddits grouped by niche, industry, or interest, so you can watch a market from a single focused lens.
AI reads thousands of posts to extract recurring themes, frustrations, and feature requests, cutting through noise to find what actually matters.
Filter for high purchase-intent posts where people ask for recommendations or alternatives, turning conversations into qualified sales leads.
Large consumer panel for market research surveys, but lacks Prolific's specialized focus on academic studies and AI tuning.
Large consumer panel for market research surveys, but lacks Prolific's specialized focus on academic studies and AI tuning.
AI influencer marketing platform to find, vet, and run creator campaigns
AI influencer marketing platform to find, vet, and run creator campaigns
SpecialistThe environments frontier AI trains on, and the agents that do the recurring work
SpecialistThe environments frontier AI trains on, and the agents that do the recurring work
Enterprise-grade data annotation and AI alignment workforce, but less self-serve for academic study recruitment and casual surveys.
AI-powered Shopify spy tool for spotting winning dropshipping products and tracking competitor sales
AI-powered Shopify spy tool for spotting winning dropshipping products and tracking competitor sales
SpecialistAI data infrastructure for building production-grade models
SpecialistAI data infrastructure for building production-grade models
SpecialistSpecializes in video-based consumer interviews and AI qualitative analysis, but less focused on quantitative academic survey panels.
SpecialistSpecializes in video-based consumer interviews and AI qualitative analysis, but less focused on quantitative academic survey panels.
SpecialistSources verified B2B professionals and healthcare experts for specialized research, but lacks broad general-population academic panels.
SpecialistSources verified B2B professionals and healthcare experts for specialized research, but lacks broad general-population academic panels.
YouTube competitor research that reveals the business behind the videos
YouTube competitor research that reveals the business behind the videos
Free / Open-sourceOpen-source data labeling and evaluation platform for AI workflows, but requires bringing your own annotation workforce.
Free / Open-sourceOpen-source data labeling and evaluation platform for AI workflows, but requires bringing your own annotation workforce.
AI-powered OnlyFans management platform for creators and agencies
AI-powered OnlyFans management platform for creators and agencies
SpecialistAI-led customer interviews and research insights at scale
SpecialistAI-led customer interviews and research insights at scale
